body,html{
    height: 100%;
}
*{
    margin: 0px;
    padding: 0px;
}
.alertMask{
    position: absolute;
    top: 0;
    height: 100%;
    width: 100%;
    background-color: rgba(100, 100, 100, 0.5);
   
}
.alertMask .alert{
    display: none; 
    text-align: center;
    width: 400px;
    height: 250px;
    background-color: white;
    position: absolute;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    margin: auto;
    transform: translateY(-50px);
    background-color: black;
 }
.alertMask .title{
    background-color: red;
    width: max-content;
    margin:10px auto;
    color: white;
    user-select: none;
    padding:5px 10px;
    font-weight: bold;
    font-family: Georgia, 'Times New Roman', Times, serif;
}
.alertMask .title span{
    float: right;
    cursor: pointer;

}
.alertMask .content{
    height: 60%;
    margin-top: 20px;
    color: white;
}

.alertMask .confirm span{
    cursor: pointer;
    margin: 40px;
    color: white;
}
